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    <h1 id="title">Protocol Documentation</h1>

    <h2>Table of Contents</h2>

    <div id="toc-container">
      <ul id="toc">
        
          
          <li>
            <a href="#Booking.proto">Booking.proto</a>
            <ul>
              
                <li>
                  <a href="#com.example.Booking"><span class="badge">M</span>Booking</a>
                </li>
              
                <li>
                  <a href="#com.example.BookingStatus"><span class="badge">M</span>BookingStatus</a>
                </li>
              
                <li>
                  <a href="#com.example.BookingStatusID"><span class="badge">M</span>BookingStatusID</a>
                </li>
              
                <li>
                  <a href="#com.example.EmptyBookingMessage"><span class="badge">M</span>EmptyBookingMessage</a>
                </li>
              
              
              
              
                <li>
                  <a href="#com.example.BookingService"><span class="badge">S</span>BookingService</a>
                </li>
              
            </ul>
          </li>
        
          
          <li>
            <a href="#Customer.proto">Customer.proto</a>
            <ul>
              
                <li>
                  <a href="#com.example.Address"><span class="badge">M</span>Address</a>
                </li>
              
                <li>
                  <a href="#com.example.Customer"><span class="badge">M</span>Customer</a>
                </li>
              
              
              
              
            </ul>
          </li>
        
          
          <li>
            <a href="#Vehicle.proto">Vehicle.proto</a>
            <ul>
              
                <li>
                  <a href="#com.example.Manufacturer"><span class="badge">M</span>Manufacturer</a>
                </li>
              
                <li>
                  <a href="#com.example.Model"><span class="badge">M</span>Model</a>
                </li>
              
                <li>
                  <a href="#com.example.Vehicle"><span class="badge">M</span>Vehicle</a>
                </li>
              
                <li>
                  <a href="#com.example.Vehicle.Category"><span class="badge">M</span>Vehicle.Category</a>
                </li>
              
              
                <li>
                  <a href="#com.example.Manufacturer.Category"><span class="badge">E</span>Manufacturer.Category</a>
                </li>
              
              
                <li>
                  <a href="#Vehicle.proto-extensions"><span class="badge">X</span>File-level Extensions</a>
                </li>
              
              
            </ul>
          </li>
        
        <li><a href="#scalar-value-types">Scalar Value Types</a></li>
      </ul>
    </div>

    
      
      <div class="file-heading">
        <h2 id="Booking.proto">Booking.proto</h2><a href="#title">Top</a>
      </div>
      <p>Booking related messages.</p><p>This file is really just an example. The data model is completely</p><p>fictional.</p>

      
        <h3 id="com.example.Booking">Booking</h3>
        <p>Represents the booking of a vehicle.</p><p>Vehicles are some cool shit. But drive carefully!</p>

        
          <table class="field-table">
            <thead>
              <tr><td>Field</td><td>Type</td><td>Label</td><td>Description</td></tr>
            </thead>
            <tbody>
              
                <tr>
                  <td>vehicle_id</td>
                  <td><a href="#int32">int32</a></td>
                  <td></td>
                  <td><p>ID of booked vehicle. </p></td>
                </tr>
              
                <tr>
                  <td>customer_id</td>
                  <td><a href="#int32">int32</a></td>
                  <td></td>
                  <td><p>Customer that booked the vehicle. </p></td>
                </tr>
              
                <tr>
                  <td>status</td>
                  <td><a href="#com.example.BookingStatus">BookingStatus</a></td>
                  <td></td>
                  <td><p>Status of the booking. </p></td>
                </tr>
              
                <tr>
                  <td>confirmation_sent</td>
                  <td><a href="#bool">bool</a></td>
                  <td></td>
                  <td><p>Has booking confirmation been sent? </p></td>
                </tr>
              
                <tr>
                  <td>payment_received</td>
                  <td><a href="#bool">bool</a></td>
                  <td></td>
                  <td><p>Has payment been received? </p></td>
                </tr>
              
                <tr>
                  <td>color_preference</td>
                  <td><a href="#string">string</a></td>
                  <td></td>
                  <td><p><strong>Deprecated.</strong> Color preference of the customer. </p></td>
                </tr>
              
            </tbody>
          </table>

          
            
            
            <h4>Fields with deprecated option</h4>
            <table>
              <thead>
                <tr>
                  <td>Name</td>
                  <td>Option</td>
                </tr>
              </thead>
              <tbody>
              
                <tr>
                  <td>color_preference</td>
                  <td><p>true</p></td>
                </tr>
              
              </tbody>
            </table>
            
          

        
      
        <h3 id="com.example.BookingStatus">BookingStatus</h3>
        <p>Represents the status of a vehicle booking.</p>

        
          <table class="field-table">
            <thead>
              <tr><td>Field</td><td>Type</td><td>Label</td><td>Description</td></tr>
            </thead>
            <tbody>
              
                <tr>
                  <td>id</td>
                  <td><a href="#int32">int32</a></td>
                  <td></td>
                  <td><p>Unique booking status ID. </p></td>
                </tr>
              
                <tr>
                  <td>description</td>
                  <td><a href="#string">string</a></td>
                  <td></td>
                  <td><p>Booking status description. E.g. &#34;Active&#34;. </p></td>
                </tr>
              
            </tbody>
          </table>

          
            
            
            <h4>Validated Fields</h4>
            <table>
              <thead>
                <tr>
                  <td>Field</td>
                  <td>Validations</td>
                </tr>
              </thead>
              <tbody>
              
                <tr>
                  <td>description</td>
                  <td>
                    <ul>
                    
                      <li>string_not_empty: true</li>
                    
                      <li>length_lt: 255</li>
                    
                    </ul>
                  </td>
                </tr>
              
              </tbody>
            </table>
            
          

        
      
        <h3 id="com.example.BookingStatusID">BookingStatusID</h3>
        <p>Represents the booking status ID.</p>

        
          <table class="field-table">
            <thead>
              <tr><td>Field</td><td>Type</td><td>Label</td><td>Description</td></tr>
            </thead>
            <tbody>
              
                <tr>
                  <td>id</td>
                  <td><a href="#int32">int32</a></td>
                  <td></td>
                  <td><p>Unique booking status ID. </p></td>
                </tr>
              
            </tbody>
          </table>

          

        
      
        <h3 id="com.example.EmptyBookingMessage">EmptyBookingMessage</h3>
        <p>An empty message for testing</p>

        

        
      

      

      

      
        <h3 id="com.example.BookingService">BookingService</h3>
        <p>Service for handling vehicle bookings.</p>
        <table class="enum-table">
          <thead>
            <tr><td>Method Name</td><td>Request Type</td><td>Response Type</td><td>Description</td></tr>
          </thead>
          <tbody>
            
              <tr>
                <td>BookVehicle</td>
                <td><a href="#com.example.Booking">Booking</a></td>
                <td><a href="#com.example.BookingStatus">BookingStatus</a></td>
                <td><p>Used to book a vehicle. Pass in a Booking and a BookingStatus will be returned.</p></td>
              </tr>
            
              <tr>
                <td>BookingUpdates</td>
                <td><a href="#com.example.BookingStatusID">BookingStatusID</a></td>
                <td><a href="#com.example.BookingStatus">BookingStatus</a> stream</td>
                <td><p>Used to subscribe to updates of the BookingStatus.</p></td>
              </tr>
            
          </tbody>
        </table>

        
          
          
          <h4>Methods with HTTP bindings</h4>
          <table>
            <thead>
              <tr>
                <td>Method Name</td>
                <td>Method</td>
                <td>Pattern</td>
                <td>Body</td>
              </tr>
            </thead>
            <tbody>
            
              
              
              <tr>
                <td>BookVehicle</td>
                <td>POST</td>
                <td>/api/bookings/vehicle/{vehicle_id}</td>
                <td>*</td>
              </tr>
              
            
            </tbody>
          </table>
          
        
    
      
      <div class="file-heading">
        <h2 id="Customer.proto">Customer.proto</h2><a href="#title">Top</a>
      </div>
      <p>This file has messages for describing a customer.</p>

      
        <h3 id="com.example.Address">Address</h3>
        <p>Represents a mail address.</p>

        
          <table class="field-table">
            <thead>
              <tr><td>Field</td><td>Type</td><td>Label</td><td>Description</td></tr>
            </thead>
            <tbody>
              
                <tr>
                  <td>address_line_1</td>
                  <td><a href="#string">string</a></td>
                  <td>required</td>
                  <td><p>First address line. </p></td>
                </tr>
              
                <tr>
                  <td>address_line_2</td>
                  <td><a href="#string">string</a></td>
                  <td>optional</td>
                  <td><p>Second address line. </p></td>
                </tr>
              
                <tr>
                  <td>address_line_3</td>
                  <td><a href="#string">string</a></td>
                  <td>optional</td>
                  <td><p>Second address line. </p></td>
                </tr>
              
                <tr>
                  <td>town</td>
                  <td><a href="#string">string</a></td>
                  <td>required</td>
                  <td><p>Address town. </p></td>
                </tr>
              
                <tr>
                  <td>county</td>
                  <td><a href="#string">string</a></td>
                  <td>optional</td>
                  <td><p>Address county, if applicable. </p></td>
                </tr>
              
                <tr>
                  <td>country</td>
                  <td><a href="#string">string</a></td>
                  <td>required</td>
                  <td><p>Address country. </p></td>
                </tr>
              
            </tbody>
          </table>

          

        
      
        <h3 id="com.example.Customer">Customer</h3>
        <p>Represents a customer.</p>

        
          <table class="field-table">
            <thead>
              <tr><td>Field</td><td>Type</td><td>Label</td><td>Description</td></tr>
            </thead>
            <tbody>
              
                <tr>
                  <td>id</td>
                  <td><a href="#int32">int32</a></td>
                  <td>required</td>
                  <td><p>Unique customer ID. </p></td>
                </tr>
              
                <tr>
                  <td>first_name</td>
                  <td><a href="#string">string</a></td>
                  <td>required</td>
                  <td><p>Customer first name. </p></td>
                </tr>
              
                <tr>
                  <td>last_name</td>
                  <td><a href="#string">string</a></td>
                  <td>required</td>
                  <td><p>Customer last name. </p></td>
                </tr>
              
                <tr>
                  <td>details</td>
                  <td><a href="#string">string</a></td>
                  <td>optional</td>
                  <td><p>Customer details. </p></td>
                </tr>
              
                <tr>
                  <td>email_address</td>
                  <td><a href="#string">string</a></td>
                  <td>optional</td>
                  <td><p>Customer e-mail address. </p></td>
                </tr>
              
                <tr>
                  <td>phone_number</td>
                  <td><a href="#string">string</a></td>
                  <td>repeated</td>
                  <td><p>Customer phone numbers, primary first. </p></td>
                </tr>
              
                <tr>
                  <td>mail_addresses</td>
                  <td><a href="#com.example.Address">Address</a></td>
                  <td>repeated</td>
                  <td><p>Customer mail addresses, primary first. </p></td>
                </tr>
              
            </tbody>
          </table>

          

        
      

      

      

      
    
      
      <div class="file-heading">
        <h2 id="Vehicle.proto">Vehicle.proto</h2><a href="#title">Top</a>
      </div>
      <p>Messages describing manufacturers / vehicles.</p>

      
        <h3 id="com.example.Manufacturer">Manufacturer</h3>
        <p>Represents a manufacturer of cars.</p>

        
          <table class="field-table">
            <thead>
              <tr><td>Field</td><td>Type</td><td>Label</td><td>Description</td></tr>
            </thead>
            <tbody>
              
                <tr>
                  <td>id</td>
                  <td><a href="#int32">int32</a></td>
                  <td>required</td>
                  <td><p>The unique manufacturer ID. </p></td>
                </tr>
              
                <tr>
                  <td>code</td>
                  <td><a href="#string">string</a></td>
                  <td>required</td>
                  <td><p>A manufacturer code, e.g. &#34;DKL4P&#34;. </p></td>
                </tr>
              
                <tr>
                  <td>details</td>
                  <td><a href="#string">string</a></td>
                  <td>optional</td>
                  <td><p>Manufacturer details (minimum orders et.c.). </p></td>
                </tr>
              
                <tr>
                  <td>category</td>
                  <td><a href="#com.example.Manufacturer.Category">Manufacturer.Category</a></td>
                  <td>optional</td>
                  <td><p>Manufacturer category. Default: CATEGORY_EXTERNAL</p></td>
                </tr>
              
            </tbody>
          </table>

          

        
      
        <h3 id="com.example.Model">Model</h3>
        <p>Represents a vehicle model.</p>

        
          <table class="field-table">
            <thead>
              <tr><td>Field</td><td>Type</td><td>Label</td><td>Description</td></tr>
            </thead>
            <tbody>
              
                <tr>
                  <td>id</td>
                  <td><a href="#string">string</a></td>
                  <td>required</td>
                  <td><p>The unique model ID. </p></td>
                </tr>
              
                <tr>
                  <td>model_code</td>
                  <td><a href="#string">string</a></td>
                  <td>required</td>
                  <td><p>The car model code, e.g. &#34;PZ003&#34;. </p></td>
                </tr>
              
                <tr>
                  <td>model_name</td>
                  <td><a href="#string">string</a></td>
                  <td>required</td>
                  <td><p>The car model name, e.g. &#34;Z3&#34;. </p></td>
                </tr>
              
                <tr>
                  <td>daily_hire_rate_dollars</td>
                  <td><a href="#sint32">sint32</a></td>
                  <td>required</td>
                  <td><p>Dollars per day. </p></td>
                </tr>
              
                <tr>
                  <td>daily_hire_rate_cents</td>
                  <td><a href="#sint32">sint32</a></td>
                  <td>required</td>
                  <td><p>Cents per day. </p></td>
                </tr>
              
            </tbody>
          </table>

          

        
      
        <h3 id="com.example.Vehicle">Vehicle</h3>
        <p>Represents a vehicle that can be hired.</p>

        
          <table class="field-table">
            <thead>
              <tr><td>Field</td><td>Type</td><td>Label</td><td>Description</td></tr>
            </thead>
            <tbody>
              
                <tr>
                  <td>id</td>
                  <td><a href="#int32">int32</a></td>
                  <td>required</td>
                  <td><p>Unique vehicle ID. </p></td>
                </tr>
              
                <tr>
                  <td>model</td>
                  <td><a href="#com.example.Model">Model</a></td>
                  <td>required</td>
                  <td><p>Vehicle model. </p></td>
                </tr>
              
                <tr>
                  <td>reg_number</td>
                  <td><a href="#string">string</a></td>
                  <td>required</td>
                  <td><p>Vehicle registration number. </p></td>
                </tr>
              
                <tr>
                  <td>mileage</td>
                  <td><a href="#sint32">sint32</a></td>
                  <td>optional</td>
                  <td><p>Current vehicle mileage, if known. </p></td>
                </tr>
              
                <tr>
                  <td>category</td>
                  <td><a href="#com.example.Vehicle.Category">Vehicle.Category</a></td>
                  <td>optional</td>
                  <td><p>Vehicle category. </p></td>
                </tr>
              
                <tr>
                  <td>daily_hire_rate_dollars</td>
                  <td><a href="#sint32">sint32</a></td>
                  <td>optional</td>
                  <td><p>Dollars per day. Default: 50</p></td>
                </tr>
              
                <tr>
                  <td>daily_hire_rate_cents</td>
                  <td><a href="#sint32">sint32</a></td>
                  <td>optional</td>
                  <td><p>Cents per day. </p></td>
                </tr>
              
            </tbody>
          </table>

          

        
          <br>
          <table class="extension-table">
            <thead>
              <tr><td>Extension</td><td>Type</td><td>Base</td><td>Number</td><td>Description</td></tr>
            </thead>
            <tbody>
              
                <tr>
                  <td>series</td>
                  <td><a href="#string">string</a></td>
                  <td><a href="#com.example.Model">Model</a></td>
                  <td>100</td>
                  <td><p>Vehicle model series.</p></td>
                </tr>
              
            </tbody>
          </table>
        
      
        <h3 id="com.example.Vehicle.Category">Vehicle.Category</h3>
        <p>Represents a vehicle category. E.g. "Sedan" or "Truck".</p>

        
          <table class="field-table">
            <thead>
              <tr><td>Field</td><td>Type</td><td>Label</td><td>Description</td></tr>
            </thead>
            <tbody>
              
                <tr>
                  <td>code</td>
                  <td><a href="#string">string</a></td>
                  <td>required</td>
                  <td><p>Category code. E.g. &#34;S&#34;. </p></td>
                </tr>
              
                <tr>
                  <td>description</td>
                  <td><a href="#string">string</a></td>
                  <td>required</td>
                  <td><p>Category name. E.g. &#34;Sedan&#34;. </p></td>
                </tr>
              
            </tbody>
          </table>

          

        
      

      
        <h3 id="com.example.Manufacturer.Category">Manufacturer.Category</h3>
        <p>Manufacturer category. A manufacturer may be either inhouse or external.</p>
        <table class="enum-table">
          <thead>
            <tr><td>Name</td><td>Number</td><td>Description</td></tr>
          </thead>
          <tbody>
            
              <tr>
                <td>CATEGORY_INHOUSE</td>
                <td>0</td>
                <td><p>The manufacturer is inhouse.</p></td>
              </tr>
            
              <tr>
                <td>CATEGORY_EXTERNAL</td>
                <td>1</td>
                <td><p>The manufacturer is external.</p></td>
              </tr>
            
          </tbody>
        </table>
      

      
        <h3 id="Vehicle.proto-extensions">File-level Extensions</h3>
        <table class="extension-table">
          <thead>
            <tr><td>Extension</td><td>Type</td><td>Base</td><td>Number</td><td>Description</td></tr>
          </thead>
          <tbody>
            
              <tr>
                <td>country</td>
                <td><a href="#string">string</a></td>
                <td><a href="#com.example.Manufacturer">Manufacturer</a></td>
                <td>100</td>
                <td><p>Manufacturer country. Default: China</p></td>
              </tr>
            
          </tbody>
        </table>
      

      
    

    <h2 id="scalar-value-types">Scalar Value Types</h2>
    <table class="scalar-value-types-table">
      <thead>
        <tr><td>.proto Type</td><td>Notes</td><td>C++</td><td>Java</td><td>Python</td><td>Go</td><td>C#</td><td>PHP</td><td>Ruby</td></tr>
      </thead>
      <tbody>
        
          <tr id="double">
            <td>double</td>
            <td></td>
            <td>double</td>
            <td>double</td>
            <td>float</td>
            <td>float64</td>
            <td>double</td>
            <td>float</td>
            <td>Float</td>
          </tr>
        
          <tr id="float">
            <td>float</td>
            <td></td>
            <td>float</td>
            <td>float</td>
            <td>float</td>
            <td>float32</td>
            <td>float</td>
            <td>float</td>
            <td>Float</td>
          </tr>
        
          <tr id="int32">
            <td>int32</td>
            <td>Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint32 instead.</td>
            <td>int32</td>
            <td>int</td>
            <td>int</td>
            <td>int32</td>
            <td>int</td>
            <td>integer</td>
            <td>Bignum or Fixnum (as required)</td>
          </tr>
        
          <tr id="int64">
            <td>int64</td>
            <td>Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint64 instead.</td>
            <td>int64</td>
            <td>long</td>
            <td>int/long</td>
            <td>int64</td>
            <td>long</td>
            <td>integer/string</td>
            <td>Bignum</td>
          </tr>
        
          <tr id="uint32">
            <td>uint32</td>
            <td>Uses variable-length encoding.</td>
            <td>uint32</td>
            <td>int</td>
            <td>int/long</td>
            <td>uint32</td>
            <td>uint</td>
            <td>integer</td>
            <td>Bignum or Fixnum (as required)</td>
          </tr>
        
          <tr id="uint64">
            <td>uint64</td>
            <td>Uses variable-length encoding.</td>
            <td>uint64</td>
            <td>long</td>
            <td>int/long</td>
            <td>uint64</td>
            <td>ulong</td>
            <td>integer/string</td>
            <td>Bignum or Fixnum (as required)</td>
          </tr>
        
          <tr id="sint32">
            <td>sint32</td>
            <td>Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int32s.</td>
            <td>int32</td>
            <td>int</td>
            <td>int</td>
            <td>int32</td>
            <td>int</td>
            <td>integer</td>
            <td>Bignum or Fixnum (as required)</td>
          </tr>
        
          <tr id="sint64">
            <td>sint64</td>
            <td>Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int64s.</td>
            <td>int64</td>
            <td>long</td>
            <td>int/long</td>
            <td>int64</td>
            <td>long</td>
            <td>integer/string</td>
            <td>Bignum</td>
          </tr>
        
          <tr id="fixed32">
            <td>fixed32</td>
            <td>Always four bytes. More efficient than uint32 if values are often greater than 2^28.</td>
            <td>uint32</td>
            <td>int</td>
            <td>int</td>
            <td>uint32</td>
            <td>uint</td>
            <td>integer</td>
            <td>Bignum or Fixnum (as required)</td>
          </tr>
        
          <tr id="fixed64">
            <td>fixed64</td>
            <td>Always eight bytes. More efficient than uint64 if values are often greater than 2^56.</td>
            <td>uint64</td>
            <td>long</td>
            <td>int/long</td>
            <td>uint64</td>
            <td>ulong</td>
            <td>integer/string</td>
            <td>Bignum</td>
          </tr>
        
          <tr id="sfixed32">
            <td>sfixed32</td>
            <td>Always four bytes.</td>
            <td>int32</td>
            <td>int</td>
            <td>int</td>
            <td>int32</td>
            <td>int</td>
            <td>integer</td>
            <td>Bignum or Fixnum (as required)</td>
          </tr>
        
          <tr id="sfixed64">
            <td>sfixed64</td>
            <td>Always eight bytes.</td>
            <td>int64</td>
            <td>long</td>
            <td>int/long</td>
            <td>int64</td>
            <td>long</td>
            <td>integer/string</td>
            <td>Bignum</td>
          </tr>
        
          <tr id="bool">
            <td>bool</td>
            <td></td>
            <td>bool</td>
            <td>boolean</td>
            <td>boolean</td>
            <td>bool</td>
            <td>bool</td>
            <td>boolean</td>
            <td>TrueClass/FalseClass</td>
          </tr>
        
          <tr id="string">
            <td>string</td>
            <td>A string must always contain UTF-8 encoded or 7-bit ASCII text.</td>
            <td>string</td>
            <td>String</td>
            <td>str/unicode</td>
            <td>string</td>
            <td>string</td>
            <td>string</td>
            <td>String (UTF-8)</td>
          </tr>
        
          <tr id="bytes">
            <td>bytes</td>
            <td>May contain any arbitrary sequence of bytes.</td>
            <td>string</td>
            <td>ByteString</td>
            <td>str</td>
            <td>[]byte</td>
            <td>ByteString</td>
            <td>string</td>
            <td>String (ASCII-8BIT)</td>
          </tr>
        
      </tbody>
    </table>
  </body>
</html>

